How to choose sunglasses by type of protection?

The degree of transmission of sunlight and the level of protection from ultraviolet rays are two key indicators that determine the quality and scope of a particular model of sunglasses. So, let's look at how to choose sunglasses by type of protection.

Degree of protection of sunglasses

In total there are four levels of protection for sunglasses. Level "0" means that in these glasses you can only walk in cloudy or cloudy weather, as they pass from 80% to 100% of the sun's rays. "1" is suitable for a weak sun, for example, a summer evening. The degree of transmission of rays by lenses with such a marking is 43 - 80%. Points marked "2" are suitable for a strong sun, they can be chosen if you decide to spend the summer in the city. They retain most of the sunlight, passing to the eye from 18% to 43% of the rays. "3" is suitable for rest by the sea, where the sun is already very intense. The percentage of transmission in them is only 8-18%. The most protected points are level "4". In such lenses, your eyes will be comfortable even in the ski resort , as they pass from 3% to 8% of the sun's rays.

Information on what protection should be for sunglasses, it is worth looking at the label, which also contains data on the manufacturer. Such labels should be for any quality model. In addition, it is worth paying attention to the fact that the higher the protection, the darker the lens. So, glasses with a level of protection "4" can not even be used when driving a car, they are so dark.

Sunglasses with UV protection

How to determine the degree of protection of women's sunglasses, in addition to information on the transmission of light? For this purpose, there is one more parameter on the label - data on how many UV rays (UVA and UVB spectra) a particular model misses. There are three types of points depending on this parameter:

1. Cosmetic - these glasses practically do not detain harmful radiation (transmittance 80-100%), which means that you can wear from when the sun is not active.
2. General - glasses with this marking are perfectly suitable for use in the city, since their glasses reflect up to 70% of the radiation of both harmful spectra.
3. Finally, for recreation by the sea or in the mountains, you need to select glasses marked High UV-protection , as they reliably detain all harmful radiation, which multiplies repeatedly when reflected from water.